SU1408507A1 - D.c. to d.c. voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and m. used in the design of secondary power sources. The goal is to increase reliability by simplifying the converter circuit. The device contains two successive circuits 1,2, consisting of transistors 3-8, whose control inputs are connected to the secondary windings of the first 20 and second 21 control transformers. The secondary windings of the first 9 and second 10 output transformers are connected by means of rectifiers 11 and 12 to the output terminals. For the control of transistors 3-8, only two control transformers 20 and 21 are used, for the switching of which two are used. transistor power part of the converter. 1 sludge in (L with t

Description

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The invention relates to electrical engineering and can be used in the sources of secondary power supply systems of radio engineering, automation and supervisory technology.

The purpose of the invention is to increase the reliability of a voltage converter by simplifying the electrical circuit. The drawing shows a diagram of a constant voltage converter.

The DC converter contains two successive circuits 1 and 2, consisting respectively of the first 3, second 4, third 5 and fourth 6, fifth 7, sixth 8 transistors, connected between. the input terminals of the converter, the first 9 and second 10 output transformers, the secondary windings of which through the rectifiers 11 and 12 are connected to the output terminals of the converter; l, the control unit 13, the first 14 and the second 15 outputs of which are connected through the first 16, second J7, the third 118 and the fourth J9 diodes with servo Semi-windings of the first 20 and second | 2J control transformers, the secondary windings of which. are connected via resistors with transistor control inputs and the secondary windings of the second transformer are connected to the control inputs of the second 4 and fifth 7 transistors through the first 22 and: 23 rectifiers I I DC converter; rhenium works as follows, To the bases of transistors 5 and 8, in the Luffy mode of operation, are shifted not 1 in a sequence of 1 pulses with a duty cycle Q7 / 2 (, When the circuit operates in the sequential mode, lioro from the output 14 of the control circuit 13 to the common point of the diodes 16 and 17 positive voltage, while the output 15 from the control circuit is given an equal negative voltage or it is in a high-impedance state ... Transistors 5 and 8, a semi-terminal switch | and a transformer 20, function as a preamplifier of power to transistors 3,4, 6 and 7 of the alternator. At the same time, either the transistors of the groups 3.7 and 5, or the groups 6, 4 and 8 are opened one by one. Transformers 9 and 10 are connected across the primary windings in series. A voltage is applied to the load.

UK -2 n - n voltage

power source,;, N - transformation ratio,

In parallel addition mode, the output of the control circuit I3 is positive and the output 14 is negative or the output 14 is in a high-impedance state. The control signals to the bases of transistors 3,4, 6 and 7 come from the secondary windings of transformer 21 in such a way that transistors 4 and 7 are open simultaneously when opening any of a pair of transistors 5 and 8, the open state of transistor 5 corresponds to the open state

the transistor 6 and the closed state of the transistor 3 and vice versa; the open state of the transistor 8 corresponds to the open state of the transistor 3 and the closed state of the transistor 6 "

When the transistor 5 is turned on, the load current flows through the circuit: plus the power supply, the transistor 6j-branches into two circuits: the primary winding of the transformer 10;

next, transistor 5, minus the power supply., A voltage is applied to the load and is equal to Uj Uf, N, Toe. twice as much as the sequential add mode

When opening the transistor 8, the process proceeds anachyugically and has no features.

Output windings can also be connected either in series or in parallel.

Using the proposed DC / DC converter allows you to compensate for problems in the primary power source while maintaining small dimensions and high efficiency of the converter. In this case, only two control transformers are used to control the transistors and the converter, and two power transistors of the converter are used to switch the windings. converter circuitry and raises it

Claims (1)

Invention Formula DC to DC converter containing two consecutive circuits consisting respectively from the first, second, third and fourth, fifth, sixth transistors connected between the input voltages, the emitters of the third and sixth transistors are connected to the first input transistor, the first output transformer, the primary winding of which is connected between the points of the first and the second and fourth with the fifth transistor, the second output transformer, the primary winding of which is connected between the points of connection of the second with the third and fifth with the sixth transistors, the secondary winding of the output transformers in connected via rectifiers with output pins, a control unit, characterized in that, in order to maintain reliability by simplifying the converter circuit, the first and second controllers and four diodes, the cathodes of which are connected to the first terminals of the primary semi-windings of the first and second inserted control transformers, the second terminals of the said semi-windings of which are connected to collectors; the third and sixth transistors, the secondary windings of the first control transformer are connected via the first resistors to the control inputs of the first, second, fourth and fifth transistors, and the secondary windings of the second control transformer are connected via the second resistors to the control inputs of the first and fourth transistors and through the first and the second rectifier, connected in series with resistors, with control inputs of the second and fifth transistors.